JavaScript Validator
Check JavaScript for syntax errors, live as you type, using your browser's own engine.
No syntax errors found.
Checks for syntax errors only, using your browser's own JavaScript engine — your code is parsed but never executed, and this isn't a style linter like ESLint (no rules about unused variables, missing semicolons, etc.). Runs entirely in your browser; nothing you type is sent anywhere.
What is JavaScript Validator?
Paste JavaScript and this tool checks it for syntax errors using your browser's own JavaScript engine — your code is parsed but never executed. It's a quick syntax check, not a style linter like ESLint.
FAQ
No — it only parses the code to check for syntax errors, using JavaScript's own Function constructor, which never executes the code unless the resulting function is called (which this tool never does).
No, that's the job of a linter like ESLint. This only checks whether the code is syntactically valid JavaScript.